关键词: 油气化探, 分析, 油气成因, 陕甘宁盆地

Abstract: A new index used for oil gas geochemical prospecting,the source information,has been suggested based on the research on adsorption hydrocarbons in the cuttings of a well and in the surface soil samples from three oil gas fields which were made on Curie Point pyrolysis chromatograph with active carbon nickel wire.They are obtained by the following process:first,extracting the source finger print compounds or the characteristic compounds from various source rocks at a well's section,then searching above mentioned "finger print compounds" through the surface soils on some oil gas fields where the genetic type of oil gas is simple,and to sum all compounds grown and declined followed after these finger print compounds as a group of the surface respounding characteristic compounds i.e. source informations.Finally using the informations to draw the unusually distribution maps concerned with the surface geochemical prospecting. Take "Z" gas field in Shan Gan Ning Basin for example the unusually distribution maps of three origin of oil gas (Coal type gases originated form upper Paleozoic,oils originated form Triassic and sapropelic type gases originated form Ordovician) in this gas field have been drawn.Also the exploration proposal to extend "F" oil field have been put forward based on the geochemical prospecting. The significance indicating oil gas as using the Origin informations is very definite.Also we could infer age of oil bearing stratum,perhaps discover new oil bearing stratum and draw the unusually distribution of each origin of oil gas in the field existing several different origin of oil gas.Accordance between surface and subsurface for geochemical prospecting will be increa sing.

Key words: surface geochemical prospecting of oil & gas, analysis, source of oil & gas, ShangGanNing Basin